A neighbor to the hot dog restaurant called the owner to report that at about 7 a.m. two suspicious people were near the area of the eatery's grease bin, police said.
It was not known how much grease was taken from the bin, police said. But the owner said this was not the first time cooking oil has been taken from the restaurant, police said.
The oil from fast food restaurants such as Rawley's can be used as bio-fuel, and that could be the reason behind the theft, police said.
The witness got a license plate number from the car the two suspects got into, police said. Police are currently investigating the incident.
Click here to follow Daily Voice Fairfield and receive free news updates.